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J/A+A/281/811     Long-term variations in V471 Tau     (Ibanoglu+ 1994)
Long-term luminosity variations and period changes in V471 Tau
     IBANOGLU C., KESKIN V., AKAN M.C., EVREN S., TUNCA Z.
    <Astron. Astrophys. 281, 811 (1994)>
    =1994A&A...281..811I
ADC_Keywords: Binaries, eclipsing; Photometry, UBV; Binaries, orbits

Keywords: stars: eclipsing binaries - stars: individual: V471 Tauri -
          stars: magnetic - stars: rotation - stars: variables

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1            79       37   The updated mean brightness of V471 Tau
                                  in B and V bands and B-V colours.
table2            46      157   The updated mid-eclipse timings and residuals
                                  using the ephemeris given in the text.
table4            20       10   Masses of the third-body depending on the
                                  orbital inclination.


Byte-by-byte Description of file: table1

   Bytes Format  Units   Label    Explanations

   1-  7  F7.2   yr      Year     
  11- 16  F6.3   mag     B        B magnitude
      17  A1     ---     r_B      [ *] When *, the value is computed.
  18- 22  F5.3   mag     e_B      []? rms uncertainty on B magnitude
  25- 29  F5.3   mag     V        V magnitude
      30  A1     ---     r_V      [ *] When *, the value is computed.
  31- 35  F5.3   mag     e_V      []? rms uncertainty on V magnitude
  38- 42  F5.3   mag     B-V      B-V colour
      43  A1     ---     r_B-V    [ *] When *, the value is computed.
  44- 48  F5.3   mag     e_B-V    []? rms uncertainty on B-V colour
  51- 55  I5     ---     E        Integer eclipse cycle number
  59- 64  F6.3   mag     DeltaB   Difference with B mean brightness
  68- 73  F6.3   mag     DeltaV   Difference with V mean brightness
  78- 79  I2     ---     Ref      References (1)

Note (1):
         1  Nelson & Young(1970)
         2  Young & Nelson(1972)
         3  Cester & Pucillo(1976)
         4  Ibanoglu(1978)
         5  Tumer et al. (1982)
         6  Oswalt(1979)
         7  Tunca et al.(1979)
         8  Skillman & Patterson(1988)
         9  Evren et al.(1986)
        10  Ibanoglu(1989)
        11  This study


Byte-by-byte Description of file: table2

   Bytes Format  Units   Label    Explanations

   1- 11  F11.5  d       Met      Mid-eclipse time - 2400000
  14- 18  I5     ---     E        Integer eclipse cycle number
  21- 28  F8.5   s       O-C(I)   Observed - calculated value
  31- 38  F8.5   s       O-C(II)  []? Observed - calculated value
  42- 46  A5     ---     Ref      References (1)

Note (1):
          1  Young  &  Lanning (1975)
          2  Cester &  Pucillo (1976)
          3  Anderson  &  Seeds (1972)
          4  Warner et al. (1971)
          5  Lohsen (1974)
          6  Ibanoglu (1978)
          7  Oliver & Rucinski (1978)
          8  Beavers et al. (1979)
          9  Tunca et al. (1979)
         10  Tumer et  al. (1982)
         11  Young et al. (1983)
         12  Ibanoglu &  Evren (1984)
         13  Ibanoglu  (1989)
         14  Skillman &  Patterson (1988)
         15  Eitter (1987)
         16  This study


Byte-by-byte Description of file: table4

   Bytes Format  Units   Label    Explanations

   6-  7  I2     deg     I        Inclination
  16- 20  F5.3   solMass M        Mass


Table 3: Parameters of the third-body orbit.
  --------------------------------------------------
  Parameter  Value               Standard deviation
  --------------------------------------------------
  a sin i   3.483 x 10+7 km      0.057 x 10+7 km
  e         0.614                0.035
  w         29.3 deg             3.2 deg
  To        HJD 24 40982         43
  Po        8548 days            48 days
  to        HJD 2440610.06434    0.00015
  P'        0.521183286 days     3 x 10-9 days
  --------------------------------------------------
(End)                                    Patricia Bauer      [CDS]   17-Nov-1993